The wind breaks the doors of the window, scatters the papers and throws down the books on the shelf. It also tears the pages of the books and brings rain.
In Fig. 9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130° and ∠ ECD = 20°. Find ∠ BAC.